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3 years ago

5

The lowest temperature on Thursday was -20 degrees C. The lowest temperature on Saturday was -12 degrees C. What was the differe

nce between the lowest temperatures

1 answer:

Korolek [52]3 years ago

4 0

Answer: -8 degrees C.

Step-by-step explanation:

if you hear the what is the difference then you know you'll subtract:)

-20 - -12 = -8 degrees C.

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(11 points) someone help with these two problems asap (inequalities)

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It is 4. 2x + 3 < -9= -6

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Hello!

-x / 4 + 5 = -3

Subtract 5 from both sides

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Multiply both sides by 4

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6. y = -3x + 2<br> y = -3x - 7

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Answer:

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Step-by-step explanation:

y=-3x+2

y=-3x-7

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-3x+2=-3x-7

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element X is a radioactive isotope such that every 21 years, its mass decreases by half. Given that the initial mass of a sample

pashok25 [27]

Answer:

The percentage rate of decay per year is of 3.25%.

The function showing the mass of the sample remaining after t is $A(t) = 80(0.9675)^t$

Step-by-step explanation:

Equation for decay of substance:

The equation that models the amount of a decaying substance after t years is given by:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount and r is the decay rate, as a decimal.

Every 21 years, its mass decreases by half.

This means that $A(21) = 0.5A(0)$ . We use this to find r, the percentage rate of decay per year.

$A(t) = A(0)(1-r)^t$

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$1 - r = 0.9675$

$r = 1 - 0.9675 = 0.0325$

The percentage rate of decay per year is of 3.25%.

Given that the initial mass of a sample of Element X is 80 grams.

This means that $A(0) = 80$

The equation is:

$A(t) = A(0)(1-r)^t$

$A(t) = 80(1-0.0325)^t$

$A(t) = 80(0.9675)^t$

The function showing the mass of the sample remaining after t is $A(t) = 80(0.9675)^t$

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